US6173738B1 - Pressure maintenance valve for pneumatic apparatus such as air spring systems - Google Patents

Pressure maintenance valve for pneumatic apparatus such as air spring systems Download PDF

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Publication number
US6173738B1
US6173738B1 US09/350,146 US35014699A US6173738B1 US 6173738 B1 US6173738 B1 US 6173738B1 US 35014699 A US35014699 A US 35014699A US 6173738 B1 US6173738 B1 US 6173738B1
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US
United States
Prior art keywords
valve
membrane
pressure
housing
inlet
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Expired - Lifetime
Application number
US09/350,146
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English (en)
Inventor
Andreas Opara
Gerhard Lohmann
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Mercedes Benz Group AG
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DaimlerChrysler AG
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Application filed by DaimlerChrysler AG filed Critical DaimlerChrysler AG
Assigned to DAIMLER CHRYSLER AG reassignment DAIMLER CHRYSLER AG ASSIGNMENT OF ASSIGNORS INTEREST (SEE DOCUMENT FOR DETAILS). Assignors: LOHMANN GERHARD, OPARA ANDREAS
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Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B60—VEHICLES IN GENERAL
    • B60G—VEHICLE SUSPENSION ARRANGEMENTS
    • B60G17/00—Resilient suspensions having means for adjusting the spring or vibration-damper characteristics, for regulating the distance between a supporting surface and a sprung part of vehicle or for locking suspension during use to meet varying vehicular or surface conditions, e.g. due to speed or load
    • B60G17/02—Spring characteristics, e.g. mechanical springs and mechanical adjusting means
    • B60G17/04—Spring characteristics, e.g. mechanical springs and mechanical adjusting means fluid spring characteristics
    • B60G17/052—Pneumatic spring characteristics
    • B60G17/0523—Regulating distributors or valves for pneumatic springs
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16K—VALVES; TAPS; COCKS; ACTUATING-FLOATS; DEVICES FOR VENTING OR AERATING
    • F16K17/00—Safety valves; Equalising valves, e.g. pressure relief valves
    • F16K17/02—Safety valves; Equalising valves, e.g. pressure relief valves opening on surplus pressure on one side; closing on insufficient pressure on one side
    • F16K17/04—Safety valves; Equalising valves, e.g. pressure relief valves opening on surplus pressure on one side; closing on insufficient pressure on one side spring-loaded
    • F16K17/0446—Safety valves; Equalising valves, e.g. pressure relief valves opening on surplus pressure on one side; closing on insufficient pressure on one side spring-loaded with an obturating member having at least a component of their opening and closing motion not perpendicular to the closing faces
    • F16K17/0453—Safety valves; Equalising valves, e.g. pressure relief valves opening on surplus pressure on one side; closing on insufficient pressure on one side spring-loaded with an obturating member having at least a component of their opening and closing motion not perpendicular to the closing faces the member being a diaphragm
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16K—VALVES; TAPS; COCKS; ACTUATING-FLOATS; DEVICES FOR VENTING OR AERATING
    • F16K15/00—Check valves
    • F16K15/14—Check valves with flexible valve members
    • F16K15/141—Check valves with flexible valve members the closure elements not being fixed to the valve body
    • F16K15/142—Check valves with flexible valve members the closure elements not being fixed to the valve body the closure elements being shaped as solids of revolution, e.g. toroidal or cylindrical rings
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
    • Y10T137/00—Fluid handling
    • Y10T137/7722—Line condition change responsive valves
    • Y10T137/7781—With separate connected fluid reactor surface
    • Y10T137/7834—Valve seat or external sleeve moves to open valve
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
    • Y10T137/00—Fluid handling
    • Y10T137/7722—Line condition change responsive valves
    • Y10T137/7781—With separate connected fluid reactor surface
    • Y10T137/7835—Valve seating in direction of flow
    • Y10T137/7836—Flexible diaphragm or bellows reactor

Definitions

  • the invention relates to a pressure maintenance valve for air spring systems and pneumatic apparatus with a housing to which an air supply line originating from a pump and a pressure relief line are connected.
  • the pressure maintenance valve is to maintain a certain pressure in a consumer, which generally is permanently connected to a pressure source such as a pump or compressor, at a predetermined minimum value when the pump is switched off or has become inoperative or the pressure of the pressure source has dropped or if the consumer has been separated from the pressure source.
  • the known pressure control valve is at least in part of a hose valve design as it has been used in the past bicycle tubes.
  • a supply line connected to a pump terminates in a valve tube which is surrounded by an elastic rubber hose. In contrast to the bicycle tube valve however the duct line leading to the consumer is symmetrical to the supply duct.
  • the rubber hose is fixed at its opposite ends to the valve tube in a gas tight manner.
  • the valve opens.
  • the open position is the normal position, particularly in pneumatic vehicle spring systems.
  • the rubber hose acting as a valve member is always in a stretched state so that, in time, it loses the elasticity required for appropriate sealing.
  • a valve member is disposed in the housing and includes a membrane having at one side thereof an annular valve structure disposed opposite an annular valve seat which divides the space adjacent the membrane into inner and outer concentric chambers when the valve structure is seated on the valve seat.
  • a valve spring is disposed at the other side of the membrane for biasing the membrane into engagement with the valve seat.
  • One of the concentric chambers is in communication with the inlet passage and the other with the outlet passage, whereby the membrane is held in an open valve position as long as the pressure in the inlet and outlet passages is greater than a certain value but the membrane closes the valve to maintain the predetermined pressure in the outlet passage when the pressure falls below the certain value.
  • the membrane is manufactured in the shape, which it assumes in its valve opening position.
  • the membrane may be for example in the form of planar apertured disk consisting of a rubber-like elastic material which has the shape in which it was manufactured when the gas pressure in the pressure control valve is at normal system operating pressure. Only when the system pressure falls to a given maintenance level the membrane is deformed to close the valve.
  • the membrane may have one or several concentric corrugations extending from one or both sides thereof.
  • FIG. 1 is a cross-sectional view of a pressure maintenance valve according to the invention shown in an open state
  • FIG. 2 is a cross-sectional view of the valve in a closed state.
  • the pressure control valve as shown in FIGS. 1 and 2 comprises seven building components. Those are three housing parts ( 11 , 31 , 45 ), a valve member ( 51 ), a valve spring ( 43 ) with its spring guide element ( 41 ) and a closing member ( 44 ).
  • the housing parts 11 , 31 are essentially turned pieces.
  • the housing part 11 is connected to a pressurized gas supply (pump). It is essentially tubular and has a stepped outer contour and a stepped bore 12 , which however does not extend axially through the housing part 11 .
  • the bore 12 represents the gas supply opening for the valve.
  • the housing part 11 comprises three sections. The first section is provided with an internal thread 13 for mounting a pressurized gas supply line to the housing part 11 .
  • the following section includes an annular recess 14 , which intersects the ends of a number of gas supply bores 17 extending parallel to the axis of the valve and being arranged in a circumferentially spaced relationship.
  • the final section includes a blind end bore 15 .
  • the housing part 11 includes an internally stepped bore 22 having a first portion provided with an internal thread 23 .
  • the second portion includes a recess 24 with a flat end wall.
  • Between the first and the second portion there is an intermediate front surface 25 provided with an annular channel 18 .
  • the supply bores 17 are drilled into the housing part 11 from the annular channel 18 and provide for communication between the bore 12 and the annular channel 18 .
  • the transition between the recess 24 and the annular channel 18 is formed by an annular wall with a semi-circularly rounded front end—as seen in a cross-sectional view—which forms a valve seat 19 .
  • the consumer end housing part 31 also has a stepped outer contour with a conical outer end section having a conical thread 32 for a pressure-tight mounting to a consumer, for example, an air bellows, or an armature disposed in front thereof.
  • the second outer section includes an external thread 33 . Adjacent the external thread 33 , the second outer section includes an annular recess 34 in which an annular rubber-like elastic ring 44 is disposed for closing radial pressure relief openings 36 .
  • the housing part 31 includes an annular axial groove 35 in which a valve spring 43 and a membrane support ring 41 are disposed.
  • the groove 35 is in communication with the annular recess 34 by the radial bores 36 forming the pressure relief openings.
  • the housing part 31 has a central axial passage 38 forming the valve discharge line.
  • the consumer end housing part 31 is threaded with its external thread 33 into the internal thread 23 of the housing part 11 for interconnection of the two housing parts.
  • a membrane 51 is compressed and held in position so as to serve as a valve member.
  • the membrane 51 may consist for example of rubber and is manufactured in the form as it is represented in FIG. 1, that is, in the shape which it assumes in the open position of the valve since the valve is in its open position almost for the duration of its life.
  • the membrane 51 has generally the shape of an apertured disk. Its outer diameter corresponds about to the inner diameter of the internal thread 23 , whereas its inner diameter corresponds to the diameter of the central passage 38 extending through the housing part 31 .
  • the membrane 51 includes seal bulges 53 and 54 .
  • the outer seal bulge 53 is clamped between an annular recess 26 formed in the intermediate intermediate front surface 25 of the housing part 11 and the inner front end of the housing part 31 .
  • the inner front end of the housing part 31 includes an annular groove 37 receiving an annular axial projection of the membrane 51 .
  • the center part of the membrane 51 around the center aperture thereof is seated on a tubular component 45 , which is disposed within the central passage 38 and projects therefrom toward the housing part 11 .
  • the tubular component 51 is provided with a flange 46 through which at least one radial bore extends or which has at least one radial groove 47 at its front end.
  • the radial groove 47 provides for communication between the area around the flange 46 formed by the stepped bore 22 and the central passage 38 .
  • the tubular component 45 which may consist of a plastic material, is inserted into the central passage 38 with the membrane 51 disposed thereon.
  • the inner seal bulge 55 of the membrane 51 engages axially the flange 46 of the tubular component 45 .
  • the flange 46 is somewhat recessed at the transition to the tubular portion which extends into the central passage 38 to improve seating and sealing of the membrane on the tubular component 45 .
  • both seal bulges 53 , 55 project axially beyond the regular plate-like curved membrane disk surface 58 , 59 at the supply side (pump side) of the housing by about 1 mm.
  • the seal bulges 53 , 55 abut the housing part 11 and the tubular component 45 in a radial plane when the membrane is subjected to air under pressure.
  • the membrane 51 includes an intermediate circular bulge 56 , which is disposed between the outer and inner membrane disc areas 58 and 59 and which is a valve seal bulge.
  • the valve seal bulge 56 has for example a squared cross-section.
  • the seal bulge 56 Toward the pump-side housing part 11 , the seal bulge 56 has an annular seal groove 57 , which is disposed directly opposite the valve seat 19 and has a shape complementary to the valve seat 19 .
  • the seal bulge 56 forms the valve member part opposite the valve seat 19 .
  • the part of the intermediate seal bulge 56 disposed on the backside of the membrane 51 is seated on the membrane support ring 41 .
  • the membrane support ring 41 is a hollow cylindrical member, which has a stepped inner surface forming a flanged cylinder.
  • the flanged cylinder forms in the area of the seal bulge 56 a shoulder, which is engaged by the valve spring 43 .
  • the valve spring 43 is seated with its opposite end on the base of the axial groove 35 .
  • the front side of the membrane support ring 41 directed toward the pump side includes an annular recess 42 , which has a cross-section corresponding to the cross-section of the intermediate seal bulge 56 so as to provide a form-locking interconnection between the seal ring bulge 56 and the support ring 41 .
  • the membrane 51 as a result, centers the membrane support ring 41 in the axial groove 35 .
  • the pressure maintenance valve is disposed for example directly at a supporting part of a spring bellows.
  • the spring bellows is connected to the air compressor by way of the pressure maintenance valve. After the pressure maintenance valve is mounted, the spring bellows is filled with compressed air by way of the pressure maintenance valve.
  • the compressed air flows from the compressor through a supply line, that is, the stepped bore 12 (see FIG. 2) into the pressure maintenance valve. From the stepped bore 12 , the compressed air flows via the recess 14 and the gas supply bores 17 to the annular channel 18 .
  • the membrane 51 of the closed valve is seated with its intermediate circular bulge 56 on the valve seat 19 under the force of the valve spring 43 .
  • the valve opens below the minimum maintenance pressure:
  • the membrane 51 is curved toward the discharge end of the valve and the valve bulge is unseated from the valve seat 19 (see FIG. 1 ).
  • the membrane support ring 41 is seated on the base of the axial annular groove 35 when the valve is fully open so that the membrane is in a stable position.
  • the compressed air reaches the radial groove 47 and then the spring bellows by way of the central passage 38 .
  • the pressure maintenance valve will close tightly by proper seating of the circular bulge 56 on the valve seat 19 and close the valve when the gas supply pressure drops, for example by a pump failure, even after years of operation.
  • the supply and discharge passages are shown in FIGS. 1 and 2 to be in axial alignment. But they can of course be arranged differently. Also, instead of threaded connections, other connections such as clamp or slide connections may be used. Furthermore, the valve may include a fully cylindrical housing and may be fitted, like a cylindrical plug into a supply pipe, a bore or a hose so as to be sealingly supported therein.

Landscapes

  • Engineering & Computer Science (AREA)
  • General Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Reciprocating Pumps (AREA)
  • Details Of Valves (AREA)
  • Safety Valves (AREA)
US09/350,146 1998-11-26 1999-07-06 Pressure maintenance valve for pneumatic apparatus such as air spring systems Expired - Lifetime US6173738B1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE19854540 1998-11-26
DE19854540A DE19854540C2 (de) 1998-11-26 1998-11-26 Druckhalteventil für Luftfederungssysteme und pneumatische Anlagen

Publications (1)

Publication Number Publication Date
US6173738B1 true US6173738B1 (en) 2001-01-16

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ID=7889075

Family Applications (1)

Application Number Title Priority Date Filing Date
US09/350,146 Expired - Lifetime US6173738B1 (en) 1998-11-26 1999-07-06 Pressure maintenance valve for pneumatic apparatus such as air spring systems

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US (1) US6173738B1 (de)
DE (1) DE19854540C2 (de)

Cited By (11)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US20040041103A1 (en) * 2002-08-30 2004-03-04 Canon Kabushiki Kaisha Positioning apparatus, charged-particle-beam exposure apparatus, and device manufacturing method
US20050155652A1 (en) * 2004-01-15 2005-07-21 Paccar Inc Pressure protection valve
CN100416148C (zh) * 2006-10-26 2008-09-03 长安大学 箱式双向调压塔
US20120175942A1 (en) * 2009-06-29 2012-07-12 Jan Grebe Pressure control valve arrangement having a pressure medium channel of oval cross-section
DE102006059160B4 (de) * 2006-03-20 2012-11-08 Ying-Che Huang Luftdüseneinrichtung
US8770361B2 (en) 2010-05-14 2014-07-08 Dr. Ing. H.C. F. Porsche Aktiengesellschaft Residual pressure holding valve and suspension strut
WO2015062779A1 (de) * 2013-11-04 2015-05-07 J. Schmalz Gmbh Ventil für unterdruckhandhabungs- oder spanneinrichtung, sowie unterdruckhandhabungseinrichtung
CN104896112A (zh) * 2015-06-19 2015-09-09 浙江盾安阀门有限公司 平衡式大流量阀芯结构
CN105443641A (zh) * 2014-08-06 2016-03-30 许炎章 一种具有耐压性能的阀座
US20160144683A1 (en) * 2014-11-24 2016-05-26 Continental Automotive Systems, Inc. Closing cover with integrated pressure retention valve housing for air spring applications
US10145437B2 (en) 2014-01-09 2018-12-04 Thyssenkrupp Bilstein Gmbh Valve device for an air spring strut

Families Citing this family (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE10216220B4 (de) 2002-04-08 2005-04-21 J. Schmalz Gmbh Unterdruckventil
DE102007012850B3 (de) * 2007-03-17 2008-10-09 Carl Freudenberg Kg Restdruckhalteventil für ein Luftfederbein
DE102010020525A1 (de) 2010-05-14 2011-11-17 Dr. Ing. H.C. F. Porsche Aktiengesellschaft Restdruckhalteventil und Federbein
DE102021201259A1 (de) 2021-01-21 2022-07-21 Continental Teves Ag & Co. Ohg Restdruckhalteventil für eine Luftfeder

Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2639194A (en) * 1950-12-21 1953-05-19 Spraying Systems Co Antidrip valve for spray nozzles
US3566913A (en) * 1968-11-14 1971-03-02 Us Navy Diaphragm valve
US3642026A (en) * 1970-04-08 1972-02-15 Air Reduction Metering valve
DE4438192A1 (de) 1994-10-26 1996-05-02 Daimler Benz Ag Luftfederbein mit einer Druckkammer für Kraftfahrzeuge
GB2308424A (en) 1995-12-19 1997-06-25 Mangar International Ltd Pressure control valve

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2639194A (en) * 1950-12-21 1953-05-19 Spraying Systems Co Antidrip valve for spray nozzles
US3566913A (en) * 1968-11-14 1971-03-02 Us Navy Diaphragm valve
US3642026A (en) * 1970-04-08 1972-02-15 Air Reduction Metering valve
DE4438192A1 (de) 1994-10-26 1996-05-02 Daimler Benz Ag Luftfederbein mit einer Druckkammer für Kraftfahrzeuge
GB2308424A (en) 1995-12-19 1997-06-25 Mangar International Ltd Pressure control valve

Cited By (15)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US20040041103A1 (en) * 2002-08-30 2004-03-04 Canon Kabushiki Kaisha Positioning apparatus, charged-particle-beam exposure apparatus, and device manufacturing method
US20050155652A1 (en) * 2004-01-15 2005-07-21 Paccar Inc Pressure protection valve
US7201184B2 (en) * 2004-01-15 2007-04-10 Paccar Inc Pressure protection valve
DE102006059160B4 (de) * 2006-03-20 2012-11-08 Ying-Che Huang Luftdüseneinrichtung
CN100416148C (zh) * 2006-10-26 2008-09-03 长安大学 箱式双向调压塔
US9180849B2 (en) * 2009-06-29 2015-11-10 Knorr-Bremse Systeme Fuer Nutzfahrzeuge Gmbh Pressure control valve arrangement having a pressure medium channel of oval cross-section
US20120175942A1 (en) * 2009-06-29 2012-07-12 Jan Grebe Pressure control valve arrangement having a pressure medium channel of oval cross-section
US8770361B2 (en) 2010-05-14 2014-07-08 Dr. Ing. H.C. F. Porsche Aktiengesellschaft Residual pressure holding valve and suspension strut
WO2015062779A1 (de) * 2013-11-04 2015-05-07 J. Schmalz Gmbh Ventil für unterdruckhandhabungs- oder spanneinrichtung, sowie unterdruckhandhabungseinrichtung
US9545726B2 (en) 2013-11-04 2017-01-17 J.Schmalz Gmbh Valve for a vacuum handling or clamping device, and vacuum handling device
US10145437B2 (en) 2014-01-09 2018-12-04 Thyssenkrupp Bilstein Gmbh Valve device for an air spring strut
CN105443641A (zh) * 2014-08-06 2016-03-30 许炎章 一种具有耐压性能的阀座
US20160144683A1 (en) * 2014-11-24 2016-05-26 Continental Automotive Systems, Inc. Closing cover with integrated pressure retention valve housing for air spring applications
US10112454B2 (en) * 2014-11-24 2018-10-30 Continental Automotive Systems, Inc. Closing cover with integrated pressure retention valve housing for air spring applications
CN104896112A (zh) * 2015-06-19 2015-09-09 浙江盾安阀门有限公司 平衡式大流量阀芯结构

Also Published As

Publication number Publication date
DE19854540C2 (de) 2001-05-31
DE19854540A1 (de) 2000-06-15

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